Well, if I read this correctly, you are gonna put a 1000W light into a box less than 2ftx2ftx2ft...

Do you realize that 1000w light will give off 3000 - 4000 BTU's of HEAT? With those tiny fans in there, the only thing you could do with that box is keep hot dogs nice and hot.
My friend, I don't want to hurt your feelings, but 1000w light will need to be 18 inches from the top of the plants. There is just not enough room in there for that size of light. Besides, there would be no way to keep the temperature moderate enough for healthy plants to live.

spaceneedle